http://www.cleanenergy.org/2009/07/17/beneficial-biofuels/

SACE | Southern Alliance for Clean Energy

Beneficial Biofuels

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This paper outlines a scientific consensus among 7 authors, as to which types of biomass can make “biofuels done right.” They must be derived from feedstocks produced with lower life-cycle greenhouse-gas emissions than traditional fossil fuels and with little or no competition with food production. Feedstocks in this category include 1) Perennial plants grown on degraded lands abandoned from agricultural use, 2) Crop residues, 3) Sustainably harvested wood and forest residues, 4) Double crops and mixed cropping systems, and 5) Municipal and industrial wastes. Beneficial-Biofuels-FULL.pdf